ETSI TS 183 002 V3.3.1 (2008-03)

Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); H.248 Profile Version 3 for controlling Access and Residential Gateways

DTS/TISPAN-03187-NGN-R3

General Information

• Status: Published
• Publication Date: 11-Aug-2009
• Technical Committee: TISPAN 3 - TISPAN Protocols
• Current Stage: 12 - Completion
• Due Date: 20-Aug-2009
• Completion Date: 12-Aug-2009

Standards Content (Sample)

ETSI TS 183 002 V3.3.1 (2009-08)
Technical Specification
Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN);
H.248 Profile Version 3 for controlling
Access and Residential Gateways

2 ETSI TS 183 002 V3.3.1 (2009-08)

Reference
DTS/TISPAN-03187-NGN-R3
Keywords
H.248, ISDN, PSTN, signalling
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ETSI
3 ETSI TS 183 002 V3.3.1 (2009-08)
Contents
Intellectual Property Rights . 6
Foreword . 6
1 Scope . 7
1.1 Differences between H.248 ARGW Profiles Version 1 and Version 2 . 7
1.2 Differences between H.248 ARGW Profiles Version 2 and Version 3 . 7
2 References . 7
2.1 Normative references . 8
2.2 Informative references . 10
3 Definitions and abbreviations . 11
3.1 Definitions . 11
3.2 Abbreviations . 11
4 Applicability . 13
4.1 Architecture . 13
4.2 Functional requirements . 14
5 Profile description . 14
5.1 Profile identification . 14
5.2 Summary . 14
5.3 Gateway control protocol version. 14
5.4 Connection model. 15
5.5 Context attributes . 16
5.6 Terminations . 16
5.6.1 Termination names . 16
5.6.1.1 Physical terminations . 16
5.6.1.2 Ephemeral terminations . 16
5.6.2 Multiplexed terminations . 17
5.7 Descriptors . 17
5.7.1 Stream descriptor . 17
5.7.1.1 LocalControl Descriptor . 17
5.7.2 Events descriptor . 18
5.7.3 EventBuffer descriptor . 19
5.7.4 Signals descriptor . 19
5.7.5 DigitMap descriptor . 20
5.7.6 Statistics descriptor . 20
5.7.7 ObservedEvents descriptor . 20
5.7.8 Topology descriptor . 21
5.7.9 Error descriptor . 21
5.8 Command API . 21
5.8.1 Add . 21
5.8.2 Modify . 21
5.8.3 Subtract . 22
5.8.4 Move . 22
5.8.5 AuditValue . 22
5.8.6 AuditCapabilities . 22
5.8.7 ServiceChange . 22
5.8.8 Manipulating and auditing context attributes . 23
5.9 Generic command syntax and encoding . 23
5.10 Transactions . 24
5.11 Messages . 24
5.12 Transport . 25
5.13 Security . 25
5.14 Packages . 26
5.14.1 Overview . 26
5.14.2 Package usage information . 28
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4 ETSI TS 183 002 V3.3.1 (2009-08)
5.14.2.1 Generic (g) . 29
5.14.2.2 Base root (root) . 31
5.14.2.3 Call progress tones generator (cg) . 32
5.14.2.4 Media GateWay (MGW) overload control (ocp) . 33
5.14.2.5 Network (nt) . 34
5.14.2.6 TDM circuit (tdmc) . 35
5.14.2.7 RTP (rtp) . 36
5.14.2.8 Extended DTMF detection (xdd) . 37
5.14.2.9 Basic services tones generator (srvtn) . 38
5.14.2.10 Expanded call progress tones generator (xcg) . 39
5.14.2.11 Enhanced alerting (alert) . 40
5.14.2.12 Analog display signalling (andisp) . 41
5.14.2.13 Generic announcement (an) . 42
5.14.2.14 Analog line supervision (al) . 43
5.14.2.15 Extended analog line supervision (xal) . 44
5.14.2.16 Automatic metering (amet) . 45
5.14.2.17 Intrusion tones generation (int) . 46
5.14.2.18 Business tones generation (biztn) . 47
5.14.2.19 Differentiated Services (ds) . 48
5.14.2.20 Quality alert ceasing (qac) . 48
5.14.2.21 Inactivity timer (it) . 49
5.14.2.22 Call type discrimination (ctyp) . 49
5.14.2.23 Stimulus analog line (stimal). 51
5.14.2.24 MGC information (MGCInfo) . 52
5.14.2.25 Statistic Conditional Reporting (scr) . 53
5.14.2.26 ETSI Notification Rate Package (etsi_nr) . 54
5.14.2.27 RTP Application Data Package (rtpad) . 54
5.14.2.28 Keepalive Request (kar) . 55
5.14.2.29 Digit Dialling Method Information for Extended Digit Map Detection (xdmi) . 56
5.15 Mandatory support of SDP and annex C information elements . 56
5.16 Procedures . 59
6 Procedures at the IP side . 59
6.1 General procedures . 59
6.2 Voiceband Data (VBD) . 59
6.2.1 General . 59
6.2.2 Interworking between V.152-compliant GWs . 61
6.2.3 Interworking between V.152-compliant and non-V.152 GWs . 61
6.2.3.1 Call/Session Originating on non-V.152 Compliant ARGW and Terminating on a V.152
Compliant ARGW . 62
6.2.3.2 Call/Session Originating on V.152 Compliant ARGW and Terminating on a non-V.152
Compliant ARGW . 65
6.2.4 VBD Transition - Change to G.711 Codec under MGC Control . 68
6.3 Support of ISDN unrestricted 64 kbit/s . 71
6.4 Comfort noise insertion and silence suppression . 71
6.5 DTMF transmission . 71
6.6 Call progress tones . 72
6.7 Support of G.711 variants . 72
6.7.1 G.711 encoding law . 72
6.7.2 G.711 silence suppression mode . 72
6.7.3 G.711 packet loss concealment . 72
6.8 MG-Internal redirection of RTP traffic . 72
6.9 Residential Media Gateway (RMG) - Keep pinhole open mechanisms for signalling and media traffic in
IP domain due to NAT Traversal support . 73
6.9.1 Problem statement in general . 73
6.9.2 Problem statement for multiple IP realm network configurations . 74
6.9.3 Possible NAT Traversal support functions when MG and MGC located in different IP realms . 75
6.9.4 Customer access via a Network Address Translation (NAT) using H.248.50 . 75
7 Procedures for Physical H.248 terminations . 76
7.1 General procedures . 76
7.1.1 Initial configuration . 76
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5 ETSI TS 183 002 V3.3.1 (2009-08)
7.1.2 DTMF detection . 76
7.1.3 Sending of tones . 76
7.1.4 Sending of announcements . 77
7.1.5 Support of emergency calls . 77
7.1.6 Echo control . 77
7.2 Specific procedures for analog lines . 78
7.2.1 Autonomous actions . 78
7.2.2 Alerting . 78
7.2.3 Automatic metering . 78
7.2.4 Display service . 79
7.2.4.1 On hook data transmission . 79
7.2.4.2 Off hook data transmission: . 79
7.3 Specific procedures for ISDN interfaces . 79
7.3.1 General . 79
7.3.2 ISDN-BA signalling . 79
7.3.2.1 Discrimination of s-type frames (layer 2 call control signalling) . 80
7.3.2.2 Discrimination of p-type frames . 80
7.3.2.3 Discrimination of f-type frames . 80
7.3.2.4 SCTP Association establishment . 80
7.3.2.4.1 IUA/SCTP for Q.931 call control signalling traffic . 81
7.3.2.4.2 IUA/SCTP for X.25 or frame relay traffic . 81
7.3.3 ISDN-PRA signalling . 81
7.3.4 NMDS . 81
7.3.5 ISDN management . 81
7.4 Specific procedures for V5 interfaces . 82
7.4.1 General . 82
7.4.2 V5 signalling . 82
7.4.3 Handling of p- and f-type frames . 82
8 MG and MGC management and call-independent procedures . 82
8.1 Overload control . 82
8.1.1 Notification Behaviour . 83
8.1.2 Adaptive Rate Based . 83
8.2 IP QoS control and monitoring. 83
8.3 Testing of analog and digital lines . 83
8.4 Real-Time Statistics Reporting. 84
8.4.1 Overview of conditional reporting . 84
8.4.2 Basic conditional reporting . 84
8.4.3 Extended conditional reporting . 84
8.5 Measurement of Resource Usage and Performance Metrics - Supported H.248 Statistics . 84
8.5.1 Usage metering . 84
8.5.1.1 Traffic Volume related Statistics . 85
8.5.1.1.1 RTP Case (general) . 85
8.5.1.1.2 RTP Case: application data. 85
8.5.1.1.3 IP Case: network layer data . 85
8.5.2 Statistics for reported metering pulses at analog lines . 86
Annex A (informative): Comparison with H.248 ARGW Profile Versions 1 and 2 . 87
A.1 General . 87
A.1.1 Version 2 . 87
A.1.2 Version 3 . 87
A.2 Differences between H.248 ARGW Profiles Version 1 and Version 2 . 87
A.3 Differences between H.248 ARGW Profiles Version 2 and Version 3 . 88
Annex B (informative): Bibliography . 89
Annex C (informative): Change history . 90
History . 91

ETSI
6 ETSI TS 183 002 V3.3.1 (2009-08)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN).
ETSI
7 ETSI TS 183 002 V3.3.1 (2009-08)
1 Scope
The present document defines a profile of the Gateway Control Protocol (H.248.1 [15]), for controlling access and
residential gateways connecting analog lines and ISDN primary and basic accesses, in order to emulate PSTN/ISDN
services over IP.
1.1 Differences between H.248 ARGW Profiles Version 1 and
Version 2
The differences between both H.248 profile versions are detailed in annex A.
Summary list of differences:
1) Package usage details (see clause 5.14.2).
2) IUA/SCTP encapsulation for Q.921 p-/f-type frames in IP domain (see clause 7.3.2).
3) Additional V5 support (see clause 7.4).
4) Adaptive-rate based MGC overload control (see clause 8.1.2).
5) Real time statistics reporting (see clause 8.4).
1.2 Differences between H.248 ARGW Profiles Version 2 and
Version 3
The differences between both H.248 profile versions are detailed in annex A.
Summary list of differences:
1) traffic volume related statistics on application data level (see clause 8.5);
2) V.152 compliant VBDoIP service (see clause 6.2);
3) addition of Digit Dialling Method Information for Extended Digit Maps Package; and
4) a keep pinhole open method for NAT traversal support (see clause 6.9).
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
ETSI
8 ETSI TS 183 002 V3.3.1 (2009-08)
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ETSI ES 282 001: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); NGN Functional Architecture Release 1".
[2] ETSI ES 282 002: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); PSTN/ISDN Emulation Sub-system (PES); Functional
architecture".
[3] ETSI ES 201 970: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);
Harmonized specification of physical and electrical characteristics at a 2-wire analogue presented
Network Termination Point (NTP)".
[4] ETSI EN 300 659-1: "Access and Terminals (AT); Analogue access to the Public Switched
Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related)
services; Part 1: On-hook data transmission".
[5] ETSI EN 300 659-2: "Access and Terminals (AT); Analogue access to the Public Switched
Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related)
services; Part 2: Off-hook data transmission".
[6] ETSI ETS 300 099: "Integrated Services Digital Network (ISDN); Specification of the Packet
Handler access point Interface (PHI)".
[7] ETSI EN 301 141-1: "Integrated Services Digital Network (ISDN); Narrowband Multi-service
Delivery System (NMDS); Part 1: NMDS interface specification".
[8] ETSI ETS 300 402-2: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Data link layer; Part 2: General protocol specification
[ITU-T Recommendation Q.921 (1993), modified]".
[9] ETSI EN 300 367: "Integrated Services Digital Network (ISDN); Explicit Call Transfer (ECT)
supplementary service; Service description".
[10] ETSI TS 102 333: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Gate control protocol".
[11] ITU-T Recommendation H.248.45: "Gateway control protocol: MGC information package".
[12] IETF RFC 4233 (2006-01): "Integrated Services Digital Network (ISDN) Q.921-User Adaptation
Layer".
[13] ETSI TBR 003: "Integrated Services Digital Network (ISDN); Attachment requirements for
terminal equipment to connect to an ISDN using ISDN basic access".
[14] ETSI TBR 004: "Integrated Services Digital Network (ISDN); Attachment requirements for
terminal equipment to connect to an ISDN using ISDN primary rate access".
[15] ITU-T Recommendation H.248.1 + Corrigendum 1: "Gateway control protocol: Version 2".
[16] ITU-T Recommendation H.248.2: "Gateway control protocol: Facsimile, text conversation and
call discrimination packages".
[17] ITU-T Recommendation H.248.4 + Corrigendum 1: "Gateway control protocol: Transport over
Stream Control Transmission Protocol (SCTP)".
[18] ITU-T Recommendation H.248.7: "Gateway control protocol: Generic Announcement package".
[19] ITU-T Recommendation H.248.11: "Gateway control protocol: Media gateway overload control
package".
[20] ITU-T Recommendation H.248.13: "Gateway control protocol: Quality Alert Ceasing package".
ETSI
9 ETSI TS 183 002 V3.3.1 (2009-08)
[21] ITU-T Recommendation H.248.14: "Gateway control protocol: Inactivity timer package".
[22] ITU-T Recommendation H.248.16 + Corrigendum 1: "Gateway control protocol: Enhanced digit
collection packages and procedures".
[23] ITU-T Recommendation H.248.23: "Gateway control protocol: Enhanced Alerting packages".
[24] ITU-T Recommendation H.248.26 + Amendment 1: "Gateway control protocol: Enhanced analog
lines packages".
[25] ITU-T Recommendation H.248.34: "Gateway control protocol: Stimulus analogue lines package".
[26] ITU-T Recommendation Q.1950: "Bearer independent call bearer control protocol".
[27] ITU-T Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".
[28] ITU-T Recommendation G.711 Appendix I: "A high quality low-complexity algorithm for packet
loss concealment with G.711".
[29] ITU-T Recommendation G.711 Appendix II: "A comfort noise payload definition for ITU-T
G.711 use in packet-based multimedia communication systems".
[30] ITU-T Recommendation T.38: "Procedures for real-time Group 3 facsimile communication over
IP networks".
[31] ITU-T Recommendation V.150.1: "Modem-over-IP networks: Procedures for the end-to-end
connection of V-series DCEs".
[32] ITU-T Recommendation V.152 + Corrigendum 1 + Corrigendum 2: "Procedures for supporting
voice-band data over IP networks".
[33] ITU-T Recommendation E.180: "Technical characteristics of tones for the telephone service".
[34] IETF RFC 2327: "SDP: Session Description Protocol".
[35] IETF RFC 3551: "RTP Profile for Audio and Video Conferences with Minimal Control".
[36] IETF RFC 4301: "Security Architecture for the Internet Protocol".
[37] IETF RFC 4733: "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".
[38] IETF RFC 2784: "Generic Routing Encapsulation (GRE)".
[39] IETF RFC 4040: "RTP Payload Format for a 64 kbit/s Transparent Call".
[40] IETF RFC 4855: "Media Type Registration of RTP Payload Formats".
[41] ITU-T Recommendation G.168: "Digital network echo cancellers".
[42] IETF RFC 2733: "An RTP Payload Format for Generic Forward Error Correction".
[43] IETF RFC 2198: "RTP Payload for Redundant Audio Data".
[44] ITU-T Recommendation Q.115.0: "Protocols for the control of signal processing network elements
and functions".
[45] ITU-T Recommendation Q.115.1: "Logic for the control of echo control devices and functions".
[46] ITU-T Recommendation Q.921: "ISDN user-network interface - Data link layer specification".
[47] ETSI ETS 300 297: "Integrated Services Digital Network (ISDN); Access digital section for ISDN
basic access".
[48] ETSI ETS 300 233: "Integrated Services Digital Network (ISDN); Access digital section for ISDN
primary rate".
[49] ITU-T Recommendation H.248.17: "Gateway control protocol: Line test packages".
ETSI
10 ETSI TS 183 002 V3.3.1 (2009-08)
[50] ETSI ES 201 235-3: "Access and Terminals (AT); Specification of Dual-Tone Multi-Frequency
(DTMF) Transmitters and Receivers; Part 3: Receivers".
[51] IETF RFC 3389: "Real-time Transport Protocol (RTP) Payload for Comfort Noise (CN)".
[52] ETSI ES 283 002 (V1.1.3): "Telecommunications and Internet converged Services and Protocols
for Advanced Networking (TISPAN); NGN Release 1 H.248 Profile for controlling Access and
Residential Gateways".
[53] IETF RFC 3807 (2004): "V5.2-User Adaptation Layer (V5UA)".
[54] ETSI EN 300 324-1: "V interfaces at the digital Local Exchange (LE); V5.1 interface for the
support of Access Network (AN); Part 1: V5.1 interface specification".
[55] ETSI EN 300 347-1: "V interfaces at the digital Local Exchange (LE); V5.2 interface for the
support of Access Network (AN); Part 1: V5.2 interface specification".
[56] ITU-T Recommendation H.248.47+Revision 1 (2008-07): "Gateway control protocol: Statistic
conditional reporting package".
[57] ETSI ES 283 039-4 (V2.1.1): "Telecommunications and Internet converged Services and Protocols
for Advanced Networking (TISPAN); NGN Overload Control Architecture; Part 4: Adaptative
Control for the MGC".
[58] IETF RFC 2960: "Stream Control Transmission Protocol".
[59] ETSI TS 102 144: "Services and Protocols for Advanced Networks (SPAN); MTP/SCCP/SSCOP
and SIGTRAN (Transport of SS7 over IP); Stream Control Transmission Protocol (SCTP)
[Endorsement of RFC 2960 and RFC 3309, modified]".
[60] ITU-T Recommendation H.248.58 (06/2008): "Gateway Control Protocol: Packages for
application level H.248 Statistics".
[61] ITU-T Recommendation H.248.52 (2008): "Gateway control protocol: QoS Support Packages".
[62] ETSI ES 283 002 (V2.1.0): "Telecommunications and Internet converged Services and Protocols
for Advanced Networking (TISPAN); H.248 Profile for controlling Access and Residential
Gateways".
[63] Void.
[64] ITU-T Recommendation H.248.70 (2009): "Gateway control protocol: Dialling method
information packages".
[65] IETF RFC 5109: "RTP Payload Format for Generic Forward Error Correction".
[66] IETF RFC 4734: "Definition of Events for Modem, Fax, and Text Telephony Signals".
2.2 Informative references
[i.1] ETSI TR 183 025 (Release 2): "Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN); H.248 Non-call related procedures and
management system interaction".
[i.2] ETSI TR 183 040 (V1.1.1): "Telecommunications and Internet converged Services and Protocols
for Advanced Networking (TISPAN); H.248 POTS Message Flows based on the H.248 Profile for
controlling Access and Residential Gateways".
[i.3] ITU-T Recommendation H.248.1 (Version 3) Amendment 1: "Gateway control protocol".
[i.4] Draft ITU-T Recommendation H.248.50: "Gateway control protocol: NAT Traversal Toolkit
Packages".
ETSI
11 ETSI TS 183 002 V3.3.1 (2009-08)
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document the terms and definitions given in ITU-T Recommendation H.248.1 [15] and
the following apply:
Access GateWay (AGW): Media GateWay (MGW) that interworks a significant number of analogue lines to a packet
network and is located at the operator's premises
NOTE: See also clause 3.1of ITU-T Recommendation H.248.1 [15].
IP Port: source and destination port numbers for UDP, SCTP and TCP traffic
Media GateWay (MGW): refers both to Access Media GateWays (AMGs) and to Residential Media Gateways
(RMGs)
NOTE: See ITU-T Recommendation H.248.1 [15].
MG Port: single physical access interface at a Media GateWay. This is always a circuit oriented interface in the scope
of this H.248 Profile
NOTE: There are therefore three port types: analog port, ISDN Basic Rate Access port and Primary Rate Access
Port.
originating Media GateWay (MGW): Media GateWay (MGW) to which the calling party's physical termination is
connected
Residential GateWay (RGW): Media GateWay MGW) that interworks a small number of analogue lines
NOTE: A Residential Media Gateway (RMG) typically contains one or two analogue lines and is located at the
customer premises. See also clause 3.6 of ITU-T Recommendation H.248.1 [15].
terminating Media GateWay (MGW): Media GateWay (MGW) to which the called party's physical termination is
connected
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACO Address COmplete message
AGCF Access Gateway Control Function
AGW Access GateWay
ALN Analog Line
AMG Access Media Gateway
A-MGF Access-MGF
AN Access Network
AOC Advice of Charge
ARGW Access Residential media GateWay
BA Basic Access
BGF Border Gatweay Function
CDR Call Detail Record
CN Comfort Noise
CRC Cyclic Redundancy Check
DLCI Data Link Connection endpoint Identifier
DNS Domain Name System
DTMF Dual Tone Multi Frequency
ECD Echo Control Device
FEC Forward Error Correction
FECD Full ECD
FH Frame Handler
ETSI
12 ETSI TS 183 002 V3.3.1 (2009-08)
GRE Generic Routing Encapsulation
HECD Half-way ECD
IECD Incoming ECD
IID IUA Interface Identifier
IP Internet Protocol
IPsec IP security
ISDN Integrated Services Digital Network
ISUP ISDN User Part
IUA ISDN Q.921-User Adaptation
LD Local Descriptor
MGC Media Gateway Controller
MGF Media Gateway Function
MGW Media GateWay
MID Message Identifier
MRFP Media Resource Function Processor
NAT Network Address Translation
NMDS Narrowband Multi-service Delivery System
NT1 Network Termination (type 1)
NTN Network Terminating Node
NTP Network Termination Point
OAM Operation, Administration and Maintenance
OECD Outgoing ECD
PBX Private Branch eXchange
PES PSTN/ISDN Emulation Subsystem
PH Packet Handler
PLC Packet Loss Concealment
PLP Packet Layer Procedures
PRA Primary Rate Access
PT Payload Type
QoS Quality of Service
RD Remote Descriptor
RFC Request For Comments (IETF)
RGW Residential GateWay
RMG Residential Media Gateway
RMGC Resdiential Media Gateway Controller
R-MGF Residential-MGF
RTP Real-time Transport Protocol
SAPI Service Access Point Identifier
SCTP Stream Control Transmission Protocol
SDP Session Description Protocol
SPNE Signal Processing Network Equipment
SRV SeRVer
SSRC Synchronization SouRCe
TAS Terminal Alerting Signal
TCP Transmission Control Protocol
TDW Time Division Multiplexing
TE Terminal Equipment
TEI TE Identifier
TLS Transport Layer Security
TMGW Trunking Media GateWay
TTL Time To Live
UDP User Datag
...